Why are train tracks always laid on a bed of stones, while high-speed rail tracks are kept so clean

Why is 194 dB the sound limit, and what happens if you exceed 194 dB?

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Man spends Chinese New Year on a high-speed train with his wife, leaving netizens utterly envious

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Children's educational handmade building blocks track toy rainbow pipe ball game

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Shoddy construction causes building collapse, plunging into a 500-meter-deep pit | "Sinkhole"

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Infinitely looping track...

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The final battle! A fateful duel, a fight to the death! Superstar vs. Eagle Meteor! The championship

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Real vs. Fake Imported Bearings

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This super mech could buy you several Cullinan SUVs!

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How much havoc can an excavator wreak?

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The ultimate in automation

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Interesting building block rotating track marble assembly toy! There is also an automatic spinning p

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[MC] Traces of Civilization [Mechanical Power & Valkyrie]

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What is it like to debug a set of trackballs that have gone crazy?

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4 minutes' perfect song after revised for 6 months

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Technology changes life.

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Children's classic marble toys, rainbow plastic pipe wooden track assembly game, super decompression

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